Chromium-free or low-chromium metal surface passivation

Metal treatment – Compositions – Heat treating

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Details

148 62, 148 624, 106 1414, C23C 718, C23C 900

Patent

active

042984041

ABSTRACT:
Substrates, especially those having plated metal surfaces, and subjected to passivation treatments in baths that incorporate one or more film-forming agents at least one of which does not require chromium and includes anions or cations of elements other than chromium. Typically, the anions or cations are introduced as bath-soluble salts which react with the plated surface of the substrate to form an adherent, coherent passivation surface film. Also present within these baths are a source of hydrogen ions and a bath-soluble carboxylic acid or derivative activator for enhancing the rate of the passivation reaction. Articles passivated in baths incorporating these film-forming agents have a hydrophobic surface that exhibits corrosion resistance and that typically has a bright finish.

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patent: 2046061 (1936-06-01), Curtin
patent: 2318559 (1943-05-01), Percival
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patent: 2805969 (1957-09-01), Goodspeed et al.
patent: 2819193 (1958-01-01), Rausch
patent: 2935431 (1960-05-01), Shaw et al.
patent: 3649371 (1972-03-01), Tongyai

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